Chasing-mill



(No Model.) 2 Sheets-Sheet -1.

B. KANE.

CHASING MILL. No. 348,524. Patented Aug. 31,1886;

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2 Sheets-Sheet 2. B. KANE.

CHASING MILL.

(No Model.)

Patented Aug. 31, 1886.

InvEn m1 Ilnrrso TATES PATENT Fries.

BART KANE, OF CINCINNATI, ASSIGNOR TO JOHN D. CHAMBERS, OF CLEVELAND,OHIO.

CHASING-MILL.

SPECIFICATION forming part of Letters Patent No. 348,524, dated August31, 1886.

Application filed September 7, 1885. Serial No. 176,368. (No model.)

To (LZZ whom it may concern:

Be it known that I, Ban/r KANE, a citizen of the United States, and aresident of Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Chasing-Hills, ofwhich the following is a specification.

My invention relates particularly to mills for grinding mineralsubstances, such as founders facings, cements, paints, &c.

Its objects are, first, a means to separate the finished goods as soonas finished from the unfinished stock, so as to relieve the grinders andleave them free to act upon the coarser particles, and thus produce a.greater yield; and, second, to prevent the dust and consequent waste andannoyance caused by it.

\Vith these objects in view my invention consists of anew machine ormill, which will be first fully described in connection with theaccompanying drawings, and particularly referred to in the claims.

teferring to the drawings, in which like parts are represented bysimilar referenceletters wherever they occur, Figure 1 is a sideelevation of my improved mill placed in a building for use. Fig. 2 is aplan view of the grinders and the case whichineloses them, the top ofthe case being removed for the purpose of exposing the grimling-rollersand the pan and its attachments. Fig. 0 is an inverted plan view of thesame, the platform upon which the mill is supported and the air-valvesbeing shown in dotted lines. Fig. 4 is a central vertical section takenthrough line 00 0c of Fig. 2. Fig. is a similar view of the case, thegrinders being shown in elevation, except a portion of the periphery ofthe pan, which is broken away, and the center of the pan shown insection to illustrate the means of driving the preliminary grinder andfeedregulator,which is attached on top of the case when such is used.Fig. 6 is a side elevation of the fence or scraper, which is intended toreturn the material toward the center of the pan, so as to insure everyportion of it being acted upon by the grinders. Fig. 7 is a plan View ofthe central portion of the wheel-shafts shown in Fig. 5. Fig. Sis avertical section of a part of the case and the pan (with thegrinding-wheels removed) and the discharger,

which is used when the mill is intended as a preliminary grinder toprepare the material for the finishing-mill. Fig. 9 is an inverted planview, in detail,0l' the valve opening and closing device shown upon anenlarged scale. The ln'acket-bearing is shown in broken section to showthe means by which longitudinal motion of the opening and closing screwis prevented.

Referring first to Fig. 1, A represents the differeut'lloors of themill-building. As usual, the first floor is occupied by the packers andthe mill-driving mechanism, neither of which are shown, as they form nopart of my i11- vention. In the second floor are placed thegrinding-mills, which are inclosed within the metal cylinders B. In thethird story is located the mill-hopper O, which is fed by the ordinaryelevator. (Not shown.) The feed-spout 0 extends from this hopper down tothe center of the cap b of cylinder B. Inter-posed between the hopperand the cap I) is a charger. D, and below it the preliminary grinder E,Fig. 6, when such is used. In the upper story of the building is locatedthe receptacle F, for the finished goods. The lower part of this isconeshaped, like the ordinary hopper, the cone end extending into theroom below, and from it extends the spout f, which leads to the packersin the first story. In practice one of these receptacles is employed toreceive the finished goods from three or four mills. The spouts B extendfrom the mills up to the receptacle. The spouts f of this receptacle areprovided before they reach the hoppers with the customary valves, toclose off the supply of material while the filled barrels are changedfrom the packers and empty ones replaced.

Referring, now'fto the detail views shown on Sheet 2 of the drawings, Gis a east-metal pan. The outer portion of it is formed into an annulardepression counter to the rounded peripheries of the wheels H, which areloosely fitted upon a transverse shaft, 71, the ends of which extendthrough the case B, which is vertically slotted to receive them. Theyextend into vertically-slotted guides secured upon the outside of thecase. The edge of the ease and the slotted guides form bearings whichpermit the shaft to have vertical play within them. The central portionof the bottom of the pan is flat, like the bottom of the ordinarychaser, and upon this portion rest the flat rollers I, which do notdiffer materially from the rollers now used in the common chasers. Thepan G is firmly secured upon the upper end .of the'spindle G, the lowerend of which rests upon a step, 7. The pan is revolved by a belt, G,which passes over a pulley, G. The rollers H, like the rollers H, aresecured loosely upon a shaft, h. The ends of this shaft also passthrough the case B,and are fitted in bearings like shaft h. Theserollers H are of less diameter than the rollers H, and their shaft isplaced diagonal to the shaft 71 and underneath it. The object of placingthe shaft diagonally, instead of at a right angle to each other, is tomake room for a discharger, J, which is used when my mill is used as apreliminary grinder, and a scraper, K, which is placed diagonally to theradius of the cylinder. The lower edge of the scraper conforms to theshape of the pan, as clearly shown in Fig. 6. The purpose of thisarrangement is to return'the heavier particles of the material which arethrown by centrifugal force toward the outer edge of the pan toward itscenter. By this means none of the material is liable to escape theaction of the rollers H H I. The outside rim or periphery of the pan Gis provided with fan-blades L, which are arranged spirally from the topedge down toward the bottom edge of the pan, and extend below it to thebottom of the case B under the pan, to near theshaft G, as clearly seenin Fig. 3. The bottom of the platform has a central opening, I), whichextends upon each side of the timber a, through which the shaft Gpasses, and immediately below the bottom of the platform are arrangedtwo valves, M, to close against the timber a and shut off the supply ofair to the mill. The front ends of these valves are fitted with nuts m,which turn upon screws passed through the valves. One of these nuts is aleft and the othera right hand nut, and they receive a screw, N, one endof which is threaded to the right and the other to the left. The middleof the screw N has a groove turned around it, and the neck within thegroove is fitted in a box, a, which is secured to the platform or someother stationary part, to prevent longitudinal movement of the screw.One end of the screw is fitted with a hand wheel or lever. By thisarrangement the valves are simultaneously opened or closed and thesupply of air to the case B regulated.

The bottom edges of the wingblades L come in close proximity to thebottom, B", of the casing, so that if any heavy particles of thematerial should be thrown by centrifugal force over the edge of the panthey will be picked up by the blades and carried back into the pan. Asthe pan is revolving rapidly,

these blades coming, as they do, to near the outer casing, form ablowing-engine, which forces the dust or finished goods up through tube13 into the receptacle F, from which it passes through spoutf to thepackers. During the revolution of the pan the material is constantlythrown outward by centrifugal force and constantly returned toward thecenter by the scraper K, so that the goods are in a constant state ofcommotion, and as the blades L and case B cause a strong blast thelighter or finished goods are separated from the heavier and ungroundparts and carried up to the receptacle. is regulated by the valves M.Should it appear that the material carried up to the receptacle containsparticles that are too coarse, the valves are partially closed by thescrew N and the supply ofair limited. When the valves M are entirelyclosed against the timber a, the blast is completely cut-off. Ingrinding very heavy material, or when it is not neces sary to grind thematerial to an impalpable powder, or whenever it is found that the forceof the fan-blades L is not sufficient to carry the finished stock to thereceptacle F, an exhaust-fan may be placed in the upper part of tube B;but for ordinary purposes, when the receptacle is not too far removedfrom the grinders, the blades L will furnish sufficient blast tocompletely separate the finished from the unfinished andpartially-finished stock. It is understood, of course, that the contactor grindingsurfaces of the wheels and pan are provided with the usualchills. The top of the receptacle F is cut out and the opening closed bya muslin screen,f, which is stretched across it. This permits the escapeof air, but prevents the escape of dust. The fine dust will in timecollect upon the under side of the screen f and prevent the escape ofair. when this occurs, which will be indicated by the force with whichthe material is discharged from the tube f, the screen is freed from thedust by passing a brush over the top of it. this purpose.

In practice I use six wheels, as shown, the two large round-faced onesH, and the flatfaced ones I being upon the same shaft, and the twosmaller round-faced ones H upon the shaft h, the wheels H being of aless diameter than the wheels H, to admit of the shafts h and h crossingat the center. By this arrangement the mill will do more work. Theaction of the mill would, however, be the same if the wheels H and shafth were omitted, except that the yield would hot be so great.

In order to prevent the mill from clogging, as well as to prevent theescape of dust through spout c and-hopper 0, when the blast is from thebottom of the mill, I have provided the charger D, Fig. 1. This consistsof two shutoff valves, (1 d, which are hinged to the opposite eudscof aswinging arm, (1, which is centrally pivoted in the end of a stud, d",which projects out from the tube 0. The valves are sheet-metal gates,which are arranged to slide transversely through the spout c. The innerend of each gate has an opening which regis ters with the opening in thespout 0, when its The force of the blast I I use an ordinary flatpaint-brush for Y upturned inner end is drawn against the back of thespout. As shown in the drawings, the supply from the hopper is cut offby the upper gate while the lower one is open discharging into the mill.So soon as the charge which was between the gates (L d enters the millthe position of the gates is reversed,and the material fills the tubeabove the lower gate, when they are again thrown into the positionrepresented and another charge, which would be the amount contained inthe tube 0 between the two valves, is let into the mill. lVhen a steadyfeed is required, the lever d is brought to a vertical or nearlyvertical position. This partially-opens both valves and allows thematerial to pass directly from the hopper to the mill.

In practice it is better, where there are six or more mills used, tohave one mill fitted to prepare or partially grind the material for theothers. The mill shown in Figs. 1 to at, inelusive, with the preliminarygrinder Eomitted, will be necessary for this purpose. It is preferable,however, to use the preliminary grinder E on the linishingunills, andthis is placed, as shown in Fig. 5, on top of the case B, and between itand the charger D. The only change necessary to adapt my mill to receivethe preliminary grinder is the provision shown in Fig. '7, to permit thespindle of the grinder E to pass through the crossed shafts H and H.This is arranged by forming a boss 011 the center of the shafts, andthen flattening them down to the form shown in Fig. 7, and perforatingthe bosses to permit the spindle O of the grinder to pass through them.The shaft G, which passes through the bottom of the pan, and is keyed toit or secured to it by a screw, has an angular depression to receive theangular foot of the spindle O, to which spindle is secured the lowergrinding cone, 0. The preliminary grinder 1), Fig. 5, consists of thegrindingcone 0 and a hollow grinding-shell adapted to be verticallyadjusted with relation to the grinding-cone o by a screw, 0, to which itis attached. This preliminary grinder it is not necessary to describe indetail, as it is the invention of Louis E. Kane, and is fully shown anddescribed in apending application of his, Serial No. 169,895, June 26,.1885.

It is now only necessary to describe my improved means for dischargingthe partiallyprepared material from the preparingmill into the ordinaryreceptacle, by which the material is now fed to the elevator, whichconveys it from the chaser to the hopper (J. As seen in Figs. 2 and S,the discharger J is a box, which is hinged to the inside of the case B,and has an opening, j, in the side, which, when it is let down into thepan while it is revolving, as shown in full line, Fig. 8, will gatherthe material from the groove in the pan G; and when it becomes wellfilled with the material, it is drawn up from the outside by a handle,j, which is attached to the outer end of a wire or cord, j", theopposite end of which is secured to the top of the box 3. The box hasalso in its top an opening, j, which registers with an opening in theside of the case B, which opening discharges into a spout, j, upon theout side of the case B, and this spout discharges into the receptaclefrom which the goods are taken by the elevator to the hoppers of thefinishing-mills. \Vhilethispreliminarygrimling or p reparation isinprogress, the fan-blades will of course carry the finished material upthrough a spout, B, to the receptacle F, so that when the unfinishedportion is conveyed to the elevator it will not contain the materialalready finished in this mill.

It is obvious, of course, that the blast or exhaust above described maybe applied to the ordinary chasing-mills now in common use, and thatpart of the material which is finished in this mill, and which causes somuch dust and waste, will be forced through a tube like B to areceptacle, F, in the upper portion of the building. A portion of myinvention may thus be applied to the mills now in general use forpreparing the material for the burr-stones; but in my system Icontemplate doing away entirely with the burrs, which involve a greatloss of time and labor to keep in proper coir dition. 5, inclusive, thefan-wings attached to the pan (1, and forming a blower by their closeproximity to the shell B, and I believe this to be the best arrangement;but it is obvious that the blower might be arranged outside of the caseto discharge into it through the bottom B but I do not regard this as soconvenient as the arrangement I have shown, because it is necessary thata space be left around the pan and between it and the case, and some ofthe unground material will necessarily be thrown over the edge of thepan. By my arrangement this will be carried up by the inclined wings Land discharged into the pan to be brought under the action of thegrindingwheels, while if the fan-blower were arranged upon the outsideit would be necessary from time to time to remove the material thatwould be thrown over the edge of the pan.

\Vhat I claim as new, and desire to secure by Letters Patent, is

1. The combination, substantially as specified, in a chasing-mill, ofthe revolving pan having an annular groove or depression surrounding itsflat or horizontal center, with the wheels H, having rounded edgescounter to the groove in the pan, the flat-faced wheels I, mounted torevolve upon the flat central por' tion of the pan, the shaft h, thecase B, and the vertically-slotted guides secured to the ease to furnishbearings for the shafts and permit the wheels to accommodate themselvesto the material being acted upon.

2. The combination, substantially as specified, of the pan G- and thevertically-slotted case B with the wheels H H I and the shafts h h, thesaid wheels being journaled upon the shafts, as shown, the said shaftshaving their hearings in the vertical slots in the ease,

I. have shown in the views, Figs. 2 to l whereby the wheels arepermitted to play vertically, for the purpose set forth.

3. The combination, substantially as hereinbefore set forth, of the caseB B, tube B, and receptacle F, with a revolving pan provided upon itsperiphery with inclined wingblades, forming with the case a blower, thegrinding-Wheels resting in said pan, the shafts upon which the saidwheels are jou'rnaled, and the bearings for said shafts secured to thecase.

4. The combination, in a chasing-mill, of

lhe inclosing-case B H, tube 13, receptacle F,

the revolving pan G, wing-blades L, secured to said pan, as shown, thegrinding-wheels, their shafts and bearings, with the valves M M,arranged below the case to regulate the supplyof air to the same,substantially as shown and described.

5. The combination, in a chasing-mill, of the case B, the pan G, havinga groove around its flat center, round-faced rollers to act in saidgroove and flat-faced rollers to act upon the surface inclosed by thegroove, the shafts upon which said rollers are journaled, theshaft-bearings secured to the case, and the scraper K, secured to thecase diagonally to the radius of the pan, and having its lower edgeshaped to fit the pan, for the purpose of returning the material to nearthe center of the pan, substantially as shown and described.

6. A chasing-mill comprising the following parts: a revolving groovedpan, wheels to fit the same, as shown, the case B, tube B, receptacle F,a force-blast to force the finished material from the case to thereceptacle, the discharger J, having openingsjj and hinged to the insideof the case, and a cord, 3' to draw the filled diseharger up and lowerit into the pan, substantially as set forth.

BART KANE.

\Vitnesses Gno. J. MURRAY, 0. W. MILEs.

